I found this little device and did a little searching about it. It is called the Supertooth Light by Blue Ant. I am one of the few people that wont talk on the phone and drive at the same time. And those bluetooth headsets irritate me as well. This is a bluetooth speakerphone that clips to your sunvisor. I purchased one today for $80 from Verizon Wireless. This little thing is awesome! I thought it being a speakerphone that you would get reverb and poor sound quality, I was wrong. When I used it for the first time, I was dumbfounded on the clarity this thing had. It runs about 15 hours of talk time and 800 hours standby, I am testing that currently. It came with a 12v car charger and a really nice universal cellphone clip that attaches to the air vent. The link to the company's web site is below, it comes in black or white. If you have any questions feel free to ask.

i recently bought the BlueAnt Supertooth3 for my wife and i ($85 each on amazon)... and they work perfectly!

my wife and i are both amazed at the clairty of the built-in speaker and the built-in microphone. they are sooo easy to setup and i was able to get each one working and talking with them in less than 5 minutes.